Re: [CentOS] Re: 5.1 Anaconda Install Error SOLVED

2008-06-05 Thread William L. Maltby
On Wed, 2008-06-04 at 16:56 -0700, Kirk Bocek wrote:
 
 Scott Silva wrote:
  With PATA the device ID is based on location. Hdb is the primary slave 
  (slave on first port). There doesn't have to be a hda.
 
 I thought the point of master/slave in the IDE world was that the master was 
 acting as the controller for the slave. If that's the case, how can you have 
 a 
 slave without a master?

It's not truly any relationship like that. It's just (in the old days) a
device ID selected on the cable by jumpers on the drive. The control
is nothing more than the IDE controller selecting either 0 or 1
device ID for commands and data. The drive with the matching ID responds
while the other ignores.

In todays world, cable select might provide the ID assignment.

I'm not sure how master and slave came to be used in this scenario,
unless it had to do with BIOS boot processes back in the old days.

 snip select stuff

-- 
Bill

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Re: [CentOS] Re: 5.1 Anaconda Install Error SOLVED

2008-06-05 Thread Kirk Bocek

William L. Maltby wrote:

It's not truly any relationship like that. It's just (in the old days) a
device ID selected on the cable by jumpers on the drive. The control
is nothing more than the IDE controller selecting either 0 or 1
device ID for commands and data. The drive with the matching ID responds
while the other ignores.

In todays world, cable select might provide the ID assignment.

I'm not sure how master and slave came to be used in this scenario,
unless it had to do with BIOS boot processes back in the old days.


Well, right you are. Scroll down to Master and Slave Clarification:

http://en.wikipedia.org/wiki/Integrated_Drive_Electronics

I had been laboring under the impression that the 'master' drive controlled 
both drives on a single cable. Now I've learned the truth just in time for 
SATA to take over. :)




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Re: [CentOS] Re: 5.1 Anaconda Install Error SOLVED

2008-06-04 Thread Kirk Bocek



Scott Silva wrote:
With PATA the device ID is based on location. Hdb is the primary slave 
(slave on first port). There doesn't have to be a hda.


I thought the point of master/slave in the IDE world was that the master was 
acting as the controller for the slave. If that's the case, how can you have a 
slave without a master?

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